BRIGE: Effect of Microstructure and Interface Layer on the Fracture and Thermal Behavior of Nanocomposites

BRIGE：微观结构和界面层对纳米复合材料断裂和热行为的影响

• 批准号: 1342379
• 负责人: Addis Kidane
• 金额: $ 17.5万
• 依托单位: University of South Carolina at Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-10-01 至 2015-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1342379&HistoricalAwards=false
• 关键词: BRIGE; Effect; Microstructure; Interface; Layer

Technical Description the ProjectThis research program focusses on understanding and exploiting the effect of microstructure and interface layer on the fracture and thermal properties of particle reinforced polymer nanocomposites. Well characterized and functionalized nanocomposites will be fabricated from different particles and polymer systems. Both micro-scale and macro-scale fatigue crack growth experiments using microscopic stereo vision and digital image correlation will be conducted. Dynamic fracture experiment will also be conducted using the modified split Hokinson pressure bar technique. The thermal conductivity of the nanocomposites as-fabricated and after subjected to mechanical loading will be measured experimentally and numerically. Finally, combining the experimental results with a modified micromechanics model, the effective thermal and fracture behavior of the nanocomposite as a function of individual component properties will be determined. Non-Technical Description of the Project's SignficanceUnderstanding the fracture and thermal properties in nanocomposites as a function of individual material properties of the particles is essential and needed from small industry to large research centers for a better optimized design of nanocomposites. The outcome of this study is important especially in structures and applications where the performance of the components depends mainly on the effectiveness of providing cooling for a device hot spot. Furthermore, the findings can lead to the development of novel nanocomposite materials that can report damage and micro cracking by sensing changes in thermal properties before irreversible damage occurs. Broadening Participation of Underrepresented Groups in EngineeringThe project supports the effort to broaden the participation of underrepresented groups by directly involving students in the proposed research and through the outreach activities. As a part of continuous outreach effort, a set of laboratory demonstration events, using polymer and nanocomposites, will be organized for local high school students, of which one-third are from underrepresented groups. The students will be exposed to and familiarized with the current nanotechnology, 3D computer vision and digital image correlation techniques. The PI will also work with Historically Black Colleges and Universities in South Carolina and nearby states, through the Center for Science Education at the USC as well as the SCienceLab program there. A collaboration with a faculty member at Benedict College has already been established and will be facilitated through this BRIGE award.This research has been funded through the Broadening Participation Research Initiation Grants in Engineering solicitation, which is part of the Broadening Participation in Engineering Program of the Engineering Education and Centers Division.The research is also funded through the Experimental Program to Stimulate Competitive Research (EPSCoR), which is part of the Office of International and Integrative Activities.

本研究计划致力于了解和开发微观结构和界面层对颗粒增强聚合物纳米复合材料的断裂和热性能的影响。不同的粒子和聚合物体系将制备表征良好和功能化的纳米复合材料。将利用微观立体视觉和数字图像相关技术进行微观尺度和宏观尺度的疲劳裂纹扩展实验。还将使用改进的分离式霍金森压杆技术进行动态断裂实验。对制备的纳米复合材料和机械加载后的纳米复合材料的导热系数进行了实验和数值测量。最后，将实验结果与修正的细观力学模型相结合，将确定纳米复合材料的有效热行为和断裂行为作为单个组件属性的函数。项目意义的非技术描述了解纳米复合材料中的断裂和热性能作为颗粒的单个材料属性的函数，对于更好地优化纳米复合材料的设计，从小型工业到大型研究中心都是必不可少的和必要的。这项研究的结果在结构和应用中尤其重要，在这些结构和应用中，部件的性能主要取决于为设备热点提供冷却的有效性。此外，这些发现可能会导致新型纳米复合材料的开发，这种材料可以在不可逆损伤发生之前通过感知热性能的变化来报告损伤和微破裂。扩大代表不足群体在工程方面的参与该项目通过让学生直接参与拟议的研究和通过外联活动，支持扩大代表不足群体的参与的努力。作为持续外联工作的一部分，将为当地高中生组织一系列使用聚合物和纳米复合材料的实验室示范活动，其中三分之一来自代表性不足的群体。学生将接触并熟悉当前的纳米技术、3D计算机视觉和数字图像相关技术。PI还将通过南加州大学的科学教育中心以及那里的SCienceLab计划，与南卡罗来纳州和邻近各州的历史上的黑人学院和大学合作。与本尼迪克特学院的一名教员的合作已经建立，并将通过布里吉奖得到促进。这项研究通过工程教育和中心分部扩大参与工程计划的扩大参与研究启动补助金获得资助。研究也通过国际和综合活动办公室的刺激竞争研究实验计划(EPSCoR)提供资金。